Soy is bad.

Although we've heard great things about soy and it's incredibly high protein content in the past, this website takes a position against soy. However, before anything is presented on soy itself, it seems right to lead with research relevant to this site "Soy Free Chicken Feed."

Isoflavones are potent phytoestrogens found in soybeans. Soybean meal constitutes a main ingredient of poultry feed and isoflavones may transfer into eggs and tissues. Our objective was to determine the transfer and accumulation of isoflavones from the feed into hen eggs and tissues, making them isoflavone sources in the human diet. Isoflavone content of commercial eggs with different claims were analyzed by HPLC-MS after hydrolysis. All commercial samples contained soy isoflavones and the metabolite equol. Then, 48 laying hens were fed soy-free, regular (25% soybean meal) or isoflavonerich diet. Isoflavones were found in experimental eggs and tissues. Enhancement of the diet with 500 mg isoflavones/100g feed resulted on egg yolks containing 1000μg isoflavones/100g while livers, kidneys, hearts and muscles contained 7162 μg/100g, 3355 μg/100g , 272 μg/100g and 97 μg/100g , respectively. The results showed that diet can be altered to modulate isoflavone content in hen eggs and tissues.

The author of the study has a pro-soy view of soy protein, so the study was designed to encourage moresoy protein to be transferred to egg yolks and poultry tissue. The parameters of the study included comparing chickens fed a soy-free feed, and at the time Tropical Traditions’ soy-free Cocofeed was the only feed available for them to use. Since they started with laying hens that had been raised on a soy-based diet, they conducted periodic tests to determine how long it took the soy-protein to not show up in egg yolks after starting on the soy-free Cocofeed. No trace of the soy isoflavone was found after 10 days following the conversion to the soy-free Cocofeed.

Summary of the 8 main reason one should avoid soy (Parsed from Dr. Mercola) video below

1. 85 percent of soy grown in the US (58.6 percent worldwide) is genetically modified (GM). The purpose of genetic modification is to impart resistance to the toxic herbicide Roundup. The motive is to increase farming efficiency and provide higher margins for soy suppliers. The primary problem is that this soy is laden with this toxic herbicide. Second, this soy also contain genes from bacteria that produce a protein that has never been part of the human food supply.

GM soy has been linked to an increase in allergies. Disturbingly, the onlypublished human feeding study on GM foods ever conducted confirmed, the gene inserted into GM soy transfers into the DNA of our gut bacteria and continues to live and function. This means that years after someone stops eating GM soy, they may still have a potentially allergenic protein continuously being produced in their intestines.

Soy foods contain anti-nutritional factors such as saponins, soyatoxin, phytates, protease inhibitors, oxalates, goitrogens and estrogens. Some of these factors interfere with the enzymes you need to digest protein. While a small amount of anti-nutrients would not likely cause a problem, the amount of soy which most Americans are eating now appears extremely high. (From 1992 to 2006, soy food sales increased from $300 million to nearly $4 billion, according to the Soyfoods Association of North America. This growth came about due to a massive shift in attitudes about soy. This shift was no accident—it was the result of a massive investment in advertising by the soy industry that's been wildly successful.)

3. Soy contains hemagglutinin.

Hemagglutinin is a clot-promoting substance that causes red blood cells to clump together. These clumped cells are unable to properly carry oxygen to your tissues.

Phytic acid (Phytates) bonds to metal ions, preventing the absorption of minerals, including calcium, magnesium, iron, and zinc -- which are co-factors for optimal biochemistry in your body. This is particularly problematic for vegetarians, because eating meat reduces the mineral-blocking effects of these phytates (so it is helpful—if you do eat soy—to also eat meat).

Isoflavones are a type of phytoestrogen, which is a plant compound resembling human estrogen. These compounds mimic and recurrently block the hormone estrogen, and have been found to have adverse effects on various human tissues. Soy phytoestrogens are known to disrupt endocrine function, may cause infertility, and may promote breast cancer in women.

Drinking even two glasses of soymilk daily for one month provides enough of these compounds to alter the menstrual cycle. Although the FDA regulates estrogen-containing products, no warnings exist on soy.

Nearly 20 percent of U.S. infants are fed soy formula, but the estrogens in soy can irreversibly harm your baby's sexual development and reproductive health. Infants fed soy formula take in an estimated five birth control pills' worth of estrogen every day. Infants fed soy formula have up to 20,000 times the amount of estrogen in circulation as babies fed other formulas!